Question

A piece of chalk ca n be powdered to small piece on hammering but it is not possible in care of a piece of iron whyd

Answer 1

the particles of matter have force acting between them. this force keeps the particles together. the magnitude of this force is lesser in chalk, hence it could be easily broken down into pieces on hammering. whearas, the magnitude of this intermolecular force is more in iron, hence it cannot be broken into small pieces on hammering 

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Answer 2

chalk can be powdered to small liece on hammering because of less attraction between its interparticles whereas iron have much more attraction between its interparticles that's why...